A water pipe from a house has a length of 0.5 m exposed to air atmosphere….

A water pipe from a house
has a length of 0.5 m exposed to air
atmosphere. If the duct is made of
plastic (di=2 cm, do=2.4 cm, k=0.16 W/mK)
and during the night the temperature is
maintains at -5ºC for 14 h, with a
combined transfer coefficient of
heat by conduction and radiation of 40
W/m2K, calculate the mass of water contained
in the tube that freezes overnight,
considering that the tube contains water at
0ºC at rest (hfusion_water=333.7 kJ/kg).

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